What causes a vehicle to lose heat?

Answer

What is your coolant level? If it isn't full, make it full.

Answer

The thermostat may be stuck open. It is supposed to close when the temp falls below normal.

Answer

Outside temperature is a factor. In extreme cold, the radiator will cool much quicker.

Bad head gasket. If the head gasket is weak, it may allow engine coolant to seap into a cylinder and be thrown out through the exhaust. The engine may operate normally but there would more than likely be little or no heat and you would see white smoke coming from your tail pipe.. alot of smoke. (had this happen before).

Answer

All the other answers could cause it. Also not mixing the proper ratio of water to anti-freeze or using straight anti-freeze can cause it.

This is a good question and some of the anwsers are good, however i don't agree with using straight anti-freeze. I perfer to use straight anti-freeze and thats all we use at the radiator shop that i have worked at for the past 10 years. I think the biggest anwser thats been over looked it that your heater core could be plugged up. This is usually easy to diganose. If the engine is up to temperature BOTH hoses going to it should be hot to the touch. If one is cold and the other is hot, your heater core is plugged up. The easiest way to fix this yourself is to go to a car wash that has a wand that u can use. remove both the hoses that go to the heater core and "flush" it out both ways with the wand. Be care full cause to much pressure can make the heater core leak. As far as the thermostat being stuck shut that problem thats easy to diganose also. If the engine is up to temperature the top and bottom radiator hoses should be hot to the touch. If one is cold and the other is hot then there is not proper anti-freeze flow and you need to replace the thermostat.

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